Compound for covering the top of molten metal in ingot-molds.



JAMES E. SHEAFFER, 0F BURNHAM, PENNSYLVANIA.

COMPOUND FOR COVERING THE TOP OF MOLTEN METALIN INGOT MOLDS.

-Nu Drawing.

To-aZZ whom it may concern: i,

Be 1t known that I. James E. SlIEAFl-lill,

a citixt n of the United States. and a resident of Burnham, county of Mifllin. State'ot' Permsvlvania, have invented certain Improvements in Compounds for Loveringthe Top of Molten Metal in Ingot-Molds, of which the following is a speci at-ion;

The object of my lllYtlltlOlidS to prevent,

as much as possible. the formation ot-piping in ingots during thecas ting operation. This object I attain by placing on the top of the molten metal. after it has been poured in the ingot, a suitable"composition which will retain the heat in the upper portion of the ingot until the major. portigiirpf-the i'ngot commences to cool, when the entire mass will cool evenl v, thus materiallv. reducing the depth ofthe piping in theup'per end of the ingot,

I'Ieretot'ore, it has been the practice to place a layer of plumbago on the top of the molten 'metal so as to reduce the depth of the piping but this material is now very expensive and I find that. by the use of the compound which I will proceed to describe, good results can be attained with a great reduction in cost.

The compound which I use is a mixture of pulverized anthracite coal mixed with a petroleum oil, the oil being in; such proportion as to make a plastic mass which is placed on top of the molten steel immediatelvafter it has been poured in the ingot molds. Owing to the fact that all anthracite coal has a tendency to coke together during combustion and form clinker, the coal alone cannot be successfully used to protect the surface of the molten steel in the ingot mold, because instead of following the contour of the steel as it cools. the coal during its com- Specification of Letters Patent.

Patented Jan. 16, 1917.

Application filed April 20, 1916. Serial No. 92,514.

bustion exercises this tendency to clinker and thereby bridgesoverthe space, holding the protecting coal away from the steel at one or more points. trolema oil. I overcome this tendency to By the addition of pe-' bridge so that the protecting compound will i follow the contour of the steel as it cools and will thus be an efficient protective cover- 111g.

The mixture I have used with success is one quart of petroleum oil to one hundred pounds of carbonaceous material, but. it will be understood that the proportions ofthe in gredients may be varied without departing from the essentlal features of the invention.

'hlle I have used a petroleum oil, other hydrocarbons may be used, such as paraffin, without departing from the spirit of the invention.

, I claim;

1. A compound for protecting the exposed surface of molten steel in an ingot mold, said compoundconsisting of a niixture of pulverized coal with a hydrocarbon, the coal being in excess, and thehydrocarbon preventing the coal from bridging over the steel in the ingot mold as it cools.

2. A. compound for protecting the exposed surface of molten steel in an ingot mold, said compound consisting of a mixture of pullverlzed anthracite coal and petroleum 011, I

the anthracite qoal being in excess.

3. A compound for protecting the exposed surface of mo ten steel while in an ingot mold, said comiiound consisting of a mixture of pulverized anthracite coal and petroleum oil inabout the proportion of 'one quartof petroleum to one-f, l'iundredpounds of anthracite coal.

JAMES E. SHEAFFER. 

